xref: /openbmc/linux/net/ipv6/mcast.c (revision 95e9fd10)
1 /*
2  *	Multicast support for IPv6
3  *	Linux INET6 implementation
4  *
5  *	Authors:
6  *	Pedro Roque		<roque@di.fc.ul.pt>
7  *
8  *	Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
9  *
10  *	This program is free software; you can redistribute it and/or
11  *      modify it under the terms of the GNU General Public License
12  *      as published by the Free Software Foundation; either version
13  *      2 of the License, or (at your option) any later version.
14  */
15 
16 /* Changes:
17  *
18  *	yoshfuji	: fix format of router-alert option
19  *	YOSHIFUJI Hideaki @USAGI:
20  *		Fixed source address for MLD message based on
21  *		<draft-ietf-magma-mld-source-05.txt>.
22  *	YOSHIFUJI Hideaki @USAGI:
23  *		- Ignore Queries for invalid addresses.
24  *		- MLD for link-local addresses.
25  *	David L Stevens <dlstevens@us.ibm.com>:
26  *		- MLDv2 support
27  */
28 
29 #include <linux/module.h>
30 #include <linux/errno.h>
31 #include <linux/types.h>
32 #include <linux/string.h>
33 #include <linux/socket.h>
34 #include <linux/sockios.h>
35 #include <linux/jiffies.h>
36 #include <linux/times.h>
37 #include <linux/net.h>
38 #include <linux/in.h>
39 #include <linux/in6.h>
40 #include <linux/netdevice.h>
41 #include <linux/if_arp.h>
42 #include <linux/route.h>
43 #include <linux/init.h>
44 #include <linux/proc_fs.h>
45 #include <linux/seq_file.h>
46 #include <linux/slab.h>
47 #include <net/mld.h>
48 
49 #include <linux/netfilter.h>
50 #include <linux/netfilter_ipv6.h>
51 
52 #include <net/net_namespace.h>
53 #include <net/sock.h>
54 #include <net/snmp.h>
55 
56 #include <net/ipv6.h>
57 #include <net/protocol.h>
58 #include <net/if_inet6.h>
59 #include <net/ndisc.h>
60 #include <net/addrconf.h>
61 #include <net/ip6_route.h>
62 #include <net/inet_common.h>
63 
64 #include <net/ip6_checksum.h>
65 
66 /* Set to 3 to get tracing... */
67 #define MCAST_DEBUG 2
68 
69 #if MCAST_DEBUG >= 3
70 #define MDBG(x) printk x
71 #else
72 #define MDBG(x)
73 #endif
74 
75 /* Ensure that we have struct in6_addr aligned on 32bit word. */
76 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
77 	BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
78 	BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
79 	BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
80 };
81 
82 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
83 
84 /* Big mc list lock for all the sockets */
85 static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
86 
87 static void igmp6_join_group(struct ifmcaddr6 *ma);
88 static void igmp6_leave_group(struct ifmcaddr6 *ma);
89 static void igmp6_timer_handler(unsigned long data);
90 
91 static void mld_gq_timer_expire(unsigned long data);
92 static void mld_ifc_timer_expire(unsigned long data);
93 static void mld_ifc_event(struct inet6_dev *idev);
94 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
95 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
96 static void mld_clear_delrec(struct inet6_dev *idev);
97 static int sf_setstate(struct ifmcaddr6 *pmc);
98 static void sf_markstate(struct ifmcaddr6 *pmc);
99 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
100 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
101 			  int sfmode, int sfcount, const struct in6_addr *psfsrc,
102 			  int delta);
103 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
104 			  int sfmode, int sfcount, const struct in6_addr *psfsrc,
105 			  int delta);
106 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
107 			    struct inet6_dev *idev);
108 
109 
110 #define IGMP6_UNSOLICITED_IVAL	(10*HZ)
111 #define MLD_QRV_DEFAULT		2
112 
113 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
114 		(idev)->cnf.force_mld_version == 1 || \
115 		((idev)->mc_v1_seen && \
116 		time_before(jiffies, (idev)->mc_v1_seen)))
117 
118 #define IPV6_MLD_MAX_MSF	64
119 
120 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
121 
122 /*
123  *	socket join on multicast group
124  */
125 
126 #define for_each_pmc_rcu(np, pmc)				\
127 	for (pmc = rcu_dereference(np->ipv6_mc_list);		\
128 	     pmc != NULL;					\
129 	     pmc = rcu_dereference(pmc->next))
130 
131 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
132 {
133 	struct net_device *dev = NULL;
134 	struct ipv6_mc_socklist *mc_lst;
135 	struct ipv6_pinfo *np = inet6_sk(sk);
136 	struct net *net = sock_net(sk);
137 	int err;
138 
139 	if (!ipv6_addr_is_multicast(addr))
140 		return -EINVAL;
141 
142 	rcu_read_lock();
143 	for_each_pmc_rcu(np, mc_lst) {
144 		if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
145 		    ipv6_addr_equal(&mc_lst->addr, addr)) {
146 			rcu_read_unlock();
147 			return -EADDRINUSE;
148 		}
149 	}
150 	rcu_read_unlock();
151 
152 	mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
153 
154 	if (mc_lst == NULL)
155 		return -ENOMEM;
156 
157 	mc_lst->next = NULL;
158 	mc_lst->addr = *addr;
159 
160 	rcu_read_lock();
161 	if (ifindex == 0) {
162 		struct rt6_info *rt;
163 		rt = rt6_lookup(net, addr, NULL, 0, 0);
164 		if (rt) {
165 			dev = rt->dst.dev;
166 			dst_release(&rt->dst);
167 		}
168 	} else
169 		dev = dev_get_by_index_rcu(net, ifindex);
170 
171 	if (dev == NULL) {
172 		rcu_read_unlock();
173 		sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
174 		return -ENODEV;
175 	}
176 
177 	mc_lst->ifindex = dev->ifindex;
178 	mc_lst->sfmode = MCAST_EXCLUDE;
179 	rwlock_init(&mc_lst->sflock);
180 	mc_lst->sflist = NULL;
181 
182 	/*
183 	 *	now add/increase the group membership on the device
184 	 */
185 
186 	err = ipv6_dev_mc_inc(dev, addr);
187 
188 	if (err) {
189 		rcu_read_unlock();
190 		sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
191 		return err;
192 	}
193 
194 	spin_lock(&ipv6_sk_mc_lock);
195 	mc_lst->next = np->ipv6_mc_list;
196 	rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
197 	spin_unlock(&ipv6_sk_mc_lock);
198 
199 	rcu_read_unlock();
200 
201 	return 0;
202 }
203 
204 /*
205  *	socket leave on multicast group
206  */
207 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
208 {
209 	struct ipv6_pinfo *np = inet6_sk(sk);
210 	struct ipv6_mc_socklist *mc_lst;
211 	struct ipv6_mc_socklist __rcu **lnk;
212 	struct net *net = sock_net(sk);
213 
214 	if (!ipv6_addr_is_multicast(addr))
215 		return -EINVAL;
216 
217 	spin_lock(&ipv6_sk_mc_lock);
218 	for (lnk = &np->ipv6_mc_list;
219 	     (mc_lst = rcu_dereference_protected(*lnk,
220 			lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
221 	      lnk = &mc_lst->next) {
222 		if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
223 		    ipv6_addr_equal(&mc_lst->addr, addr)) {
224 			struct net_device *dev;
225 
226 			*lnk = mc_lst->next;
227 			spin_unlock(&ipv6_sk_mc_lock);
228 
229 			rcu_read_lock();
230 			dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
231 			if (dev != NULL) {
232 				struct inet6_dev *idev = __in6_dev_get(dev);
233 
234 				(void) ip6_mc_leave_src(sk, mc_lst, idev);
235 				if (idev)
236 					__ipv6_dev_mc_dec(idev, &mc_lst->addr);
237 			} else
238 				(void) ip6_mc_leave_src(sk, mc_lst, NULL);
239 			rcu_read_unlock();
240 			atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
241 			kfree_rcu(mc_lst, rcu);
242 			return 0;
243 		}
244 	}
245 	spin_unlock(&ipv6_sk_mc_lock);
246 
247 	return -EADDRNOTAVAIL;
248 }
249 
250 /* called with rcu_read_lock() */
251 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
252 					     const struct in6_addr *group,
253 					     int ifindex)
254 {
255 	struct net_device *dev = NULL;
256 	struct inet6_dev *idev = NULL;
257 
258 	if (ifindex == 0) {
259 		struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
260 
261 		if (rt) {
262 			dev = rt->dst.dev;
263 			dst_release(&rt->dst);
264 		}
265 	} else
266 		dev = dev_get_by_index_rcu(net, ifindex);
267 
268 	if (!dev)
269 		return NULL;
270 	idev = __in6_dev_get(dev);
271 	if (!idev)
272 		return NULL;
273 	read_lock_bh(&idev->lock);
274 	if (idev->dead) {
275 		read_unlock_bh(&idev->lock);
276 		return NULL;
277 	}
278 	return idev;
279 }
280 
281 void ipv6_sock_mc_close(struct sock *sk)
282 {
283 	struct ipv6_pinfo *np = inet6_sk(sk);
284 	struct ipv6_mc_socklist *mc_lst;
285 	struct net *net = sock_net(sk);
286 
287 	spin_lock(&ipv6_sk_mc_lock);
288 	while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
289 				lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
290 		struct net_device *dev;
291 
292 		np->ipv6_mc_list = mc_lst->next;
293 		spin_unlock(&ipv6_sk_mc_lock);
294 
295 		rcu_read_lock();
296 		dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
297 		if (dev) {
298 			struct inet6_dev *idev = __in6_dev_get(dev);
299 
300 			(void) ip6_mc_leave_src(sk, mc_lst, idev);
301 			if (idev)
302 				__ipv6_dev_mc_dec(idev, &mc_lst->addr);
303 		} else
304 			(void) ip6_mc_leave_src(sk, mc_lst, NULL);
305 		rcu_read_unlock();
306 
307 		atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
308 		kfree_rcu(mc_lst, rcu);
309 
310 		spin_lock(&ipv6_sk_mc_lock);
311 	}
312 	spin_unlock(&ipv6_sk_mc_lock);
313 }
314 
315 int ip6_mc_source(int add, int omode, struct sock *sk,
316 	struct group_source_req *pgsr)
317 {
318 	struct in6_addr *source, *group;
319 	struct ipv6_mc_socklist *pmc;
320 	struct inet6_dev *idev;
321 	struct ipv6_pinfo *inet6 = inet6_sk(sk);
322 	struct ip6_sf_socklist *psl;
323 	struct net *net = sock_net(sk);
324 	int i, j, rv;
325 	int leavegroup = 0;
326 	int pmclocked = 0;
327 	int err;
328 
329 	source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
330 	group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
331 
332 	if (!ipv6_addr_is_multicast(group))
333 		return -EINVAL;
334 
335 	rcu_read_lock();
336 	idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
337 	if (!idev) {
338 		rcu_read_unlock();
339 		return -ENODEV;
340 	}
341 
342 	err = -EADDRNOTAVAIL;
343 
344 	for_each_pmc_rcu(inet6, pmc) {
345 		if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
346 			continue;
347 		if (ipv6_addr_equal(&pmc->addr, group))
348 			break;
349 	}
350 	if (!pmc) {		/* must have a prior join */
351 		err = -EINVAL;
352 		goto done;
353 	}
354 	/* if a source filter was set, must be the same mode as before */
355 	if (pmc->sflist) {
356 		if (pmc->sfmode != omode) {
357 			err = -EINVAL;
358 			goto done;
359 		}
360 	} else if (pmc->sfmode != omode) {
361 		/* allow mode switches for empty-set filters */
362 		ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
363 		ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
364 		pmc->sfmode = omode;
365 	}
366 
367 	write_lock(&pmc->sflock);
368 	pmclocked = 1;
369 
370 	psl = pmc->sflist;
371 	if (!add) {
372 		if (!psl)
373 			goto done;	/* err = -EADDRNOTAVAIL */
374 		rv = !0;
375 		for (i=0; i<psl->sl_count; i++) {
376 			rv = memcmp(&psl->sl_addr[i], source,
377 				sizeof(struct in6_addr));
378 			if (rv == 0)
379 				break;
380 		}
381 		if (rv)		/* source not found */
382 			goto done;	/* err = -EADDRNOTAVAIL */
383 
384 		/* special case - (INCLUDE, empty) == LEAVE_GROUP */
385 		if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
386 			leavegroup = 1;
387 			goto done;
388 		}
389 
390 		/* update the interface filter */
391 		ip6_mc_del_src(idev, group, omode, 1, source, 1);
392 
393 		for (j=i+1; j<psl->sl_count; j++)
394 			psl->sl_addr[j-1] = psl->sl_addr[j];
395 		psl->sl_count--;
396 		err = 0;
397 		goto done;
398 	}
399 	/* else, add a new source to the filter */
400 
401 	if (psl && psl->sl_count >= sysctl_mld_max_msf) {
402 		err = -ENOBUFS;
403 		goto done;
404 	}
405 	if (!psl || psl->sl_count == psl->sl_max) {
406 		struct ip6_sf_socklist *newpsl;
407 		int count = IP6_SFBLOCK;
408 
409 		if (psl)
410 			count += psl->sl_max;
411 		newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
412 		if (!newpsl) {
413 			err = -ENOBUFS;
414 			goto done;
415 		}
416 		newpsl->sl_max = count;
417 		newpsl->sl_count = count - IP6_SFBLOCK;
418 		if (psl) {
419 			for (i=0; i<psl->sl_count; i++)
420 				newpsl->sl_addr[i] = psl->sl_addr[i];
421 			sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
422 		}
423 		pmc->sflist = psl = newpsl;
424 	}
425 	rv = 1;	/* > 0 for insert logic below if sl_count is 0 */
426 	for (i=0; i<psl->sl_count; i++) {
427 		rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
428 		if (rv == 0)
429 			break;
430 	}
431 	if (rv == 0)		/* address already there is an error */
432 		goto done;
433 	for (j=psl->sl_count-1; j>=i; j--)
434 		psl->sl_addr[j+1] = psl->sl_addr[j];
435 	psl->sl_addr[i] = *source;
436 	psl->sl_count++;
437 	err = 0;
438 	/* update the interface list */
439 	ip6_mc_add_src(idev, group, omode, 1, source, 1);
440 done:
441 	if (pmclocked)
442 		write_unlock(&pmc->sflock);
443 	read_unlock_bh(&idev->lock);
444 	rcu_read_unlock();
445 	if (leavegroup)
446 		return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
447 	return err;
448 }
449 
450 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
451 {
452 	const struct in6_addr *group;
453 	struct ipv6_mc_socklist *pmc;
454 	struct inet6_dev *idev;
455 	struct ipv6_pinfo *inet6 = inet6_sk(sk);
456 	struct ip6_sf_socklist *newpsl, *psl;
457 	struct net *net = sock_net(sk);
458 	int leavegroup = 0;
459 	int i, err;
460 
461 	group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
462 
463 	if (!ipv6_addr_is_multicast(group))
464 		return -EINVAL;
465 	if (gsf->gf_fmode != MCAST_INCLUDE &&
466 	    gsf->gf_fmode != MCAST_EXCLUDE)
467 		return -EINVAL;
468 
469 	rcu_read_lock();
470 	idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
471 
472 	if (!idev) {
473 		rcu_read_unlock();
474 		return -ENODEV;
475 	}
476 
477 	err = 0;
478 
479 	if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
480 		leavegroup = 1;
481 		goto done;
482 	}
483 
484 	for_each_pmc_rcu(inet6, pmc) {
485 		if (pmc->ifindex != gsf->gf_interface)
486 			continue;
487 		if (ipv6_addr_equal(&pmc->addr, group))
488 			break;
489 	}
490 	if (!pmc) {		/* must have a prior join */
491 		err = -EINVAL;
492 		goto done;
493 	}
494 	if (gsf->gf_numsrc) {
495 		newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
496 							  GFP_ATOMIC);
497 		if (!newpsl) {
498 			err = -ENOBUFS;
499 			goto done;
500 		}
501 		newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
502 		for (i=0; i<newpsl->sl_count; ++i) {
503 			struct sockaddr_in6 *psin6;
504 
505 			psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
506 			newpsl->sl_addr[i] = psin6->sin6_addr;
507 		}
508 		err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
509 			newpsl->sl_count, newpsl->sl_addr, 0);
510 		if (err) {
511 			sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
512 			goto done;
513 		}
514 	} else {
515 		newpsl = NULL;
516 		(void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
517 	}
518 
519 	write_lock(&pmc->sflock);
520 	psl = pmc->sflist;
521 	if (psl) {
522 		(void) ip6_mc_del_src(idev, group, pmc->sfmode,
523 			psl->sl_count, psl->sl_addr, 0);
524 		sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
525 	} else
526 		(void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
527 	pmc->sflist = newpsl;
528 	pmc->sfmode = gsf->gf_fmode;
529 	write_unlock(&pmc->sflock);
530 	err = 0;
531 done:
532 	read_unlock_bh(&idev->lock);
533 	rcu_read_unlock();
534 	if (leavegroup)
535 		err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
536 	return err;
537 }
538 
539 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
540 	struct group_filter __user *optval, int __user *optlen)
541 {
542 	int err, i, count, copycount;
543 	const struct in6_addr *group;
544 	struct ipv6_mc_socklist *pmc;
545 	struct inet6_dev *idev;
546 	struct ipv6_pinfo *inet6 = inet6_sk(sk);
547 	struct ip6_sf_socklist *psl;
548 	struct net *net = sock_net(sk);
549 
550 	group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
551 
552 	if (!ipv6_addr_is_multicast(group))
553 		return -EINVAL;
554 
555 	rcu_read_lock();
556 	idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
557 
558 	if (!idev) {
559 		rcu_read_unlock();
560 		return -ENODEV;
561 	}
562 
563 	err = -EADDRNOTAVAIL;
564 	/*
565 	 * changes to the ipv6_mc_list require the socket lock and
566 	 * a read lock on ip6_sk_mc_lock. We have the socket lock,
567 	 * so reading the list is safe.
568 	 */
569 
570 	for_each_pmc_rcu(inet6, pmc) {
571 		if (pmc->ifindex != gsf->gf_interface)
572 			continue;
573 		if (ipv6_addr_equal(group, &pmc->addr))
574 			break;
575 	}
576 	if (!pmc)		/* must have a prior join */
577 		goto done;
578 	gsf->gf_fmode = pmc->sfmode;
579 	psl = pmc->sflist;
580 	count = psl ? psl->sl_count : 0;
581 	read_unlock_bh(&idev->lock);
582 	rcu_read_unlock();
583 
584 	copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
585 	gsf->gf_numsrc = count;
586 	if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
587 	    copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
588 		return -EFAULT;
589 	}
590 	/* changes to psl require the socket lock, a read lock on
591 	 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
592 	 * have the socket lock, so reading here is safe.
593 	 */
594 	for (i=0; i<copycount; i++) {
595 		struct sockaddr_in6 *psin6;
596 		struct sockaddr_storage ss;
597 
598 		psin6 = (struct sockaddr_in6 *)&ss;
599 		memset(&ss, 0, sizeof(ss));
600 		psin6->sin6_family = AF_INET6;
601 		psin6->sin6_addr = psl->sl_addr[i];
602 		if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
603 			return -EFAULT;
604 	}
605 	return 0;
606 done:
607 	read_unlock_bh(&idev->lock);
608 	rcu_read_unlock();
609 	return err;
610 }
611 
612 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
613 		    const struct in6_addr *src_addr)
614 {
615 	struct ipv6_pinfo *np = inet6_sk(sk);
616 	struct ipv6_mc_socklist *mc;
617 	struct ip6_sf_socklist *psl;
618 	bool rv = true;
619 
620 	rcu_read_lock();
621 	for_each_pmc_rcu(np, mc) {
622 		if (ipv6_addr_equal(&mc->addr, mc_addr))
623 			break;
624 	}
625 	if (!mc) {
626 		rcu_read_unlock();
627 		return true;
628 	}
629 	read_lock(&mc->sflock);
630 	psl = mc->sflist;
631 	if (!psl) {
632 		rv = mc->sfmode == MCAST_EXCLUDE;
633 	} else {
634 		int i;
635 
636 		for (i=0; i<psl->sl_count; i++) {
637 			if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
638 				break;
639 		}
640 		if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
641 			rv = false;
642 		if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
643 			rv = false;
644 	}
645 	read_unlock(&mc->sflock);
646 	rcu_read_unlock();
647 
648 	return rv;
649 }
650 
651 static void ma_put(struct ifmcaddr6 *mc)
652 {
653 	if (atomic_dec_and_test(&mc->mca_refcnt)) {
654 		in6_dev_put(mc->idev);
655 		kfree(mc);
656 	}
657 }
658 
659 static void igmp6_group_added(struct ifmcaddr6 *mc)
660 {
661 	struct net_device *dev = mc->idev->dev;
662 	char buf[MAX_ADDR_LEN];
663 
664 	spin_lock_bh(&mc->mca_lock);
665 	if (!(mc->mca_flags&MAF_LOADED)) {
666 		mc->mca_flags |= MAF_LOADED;
667 		if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
668 			dev_mc_add(dev, buf);
669 	}
670 	spin_unlock_bh(&mc->mca_lock);
671 
672 	if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
673 		return;
674 
675 	if (MLD_V1_SEEN(mc->idev)) {
676 		igmp6_join_group(mc);
677 		return;
678 	}
679 	/* else v2 */
680 
681 	mc->mca_crcount = mc->idev->mc_qrv;
682 	mld_ifc_event(mc->idev);
683 }
684 
685 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
686 {
687 	struct net_device *dev = mc->idev->dev;
688 	char buf[MAX_ADDR_LEN];
689 
690 	spin_lock_bh(&mc->mca_lock);
691 	if (mc->mca_flags&MAF_LOADED) {
692 		mc->mca_flags &= ~MAF_LOADED;
693 		if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
694 			dev_mc_del(dev, buf);
695 	}
696 
697 	if (mc->mca_flags & MAF_NOREPORT)
698 		goto done;
699 	spin_unlock_bh(&mc->mca_lock);
700 
701 	if (!mc->idev->dead)
702 		igmp6_leave_group(mc);
703 
704 	spin_lock_bh(&mc->mca_lock);
705 	if (del_timer(&mc->mca_timer))
706 		atomic_dec(&mc->mca_refcnt);
707 done:
708 	ip6_mc_clear_src(mc);
709 	spin_unlock_bh(&mc->mca_lock);
710 }
711 
712 /*
713  * deleted ifmcaddr6 manipulation
714  */
715 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
716 {
717 	struct ifmcaddr6 *pmc;
718 
719 	/* this is an "ifmcaddr6" for convenience; only the fields below
720 	 * are actually used. In particular, the refcnt and users are not
721 	 * used for management of the delete list. Using the same structure
722 	 * for deleted items allows change reports to use common code with
723 	 * non-deleted or query-response MCA's.
724 	 */
725 	pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
726 	if (!pmc)
727 		return;
728 
729 	spin_lock_bh(&im->mca_lock);
730 	spin_lock_init(&pmc->mca_lock);
731 	pmc->idev = im->idev;
732 	in6_dev_hold(idev);
733 	pmc->mca_addr = im->mca_addr;
734 	pmc->mca_crcount = idev->mc_qrv;
735 	pmc->mca_sfmode = im->mca_sfmode;
736 	if (pmc->mca_sfmode == MCAST_INCLUDE) {
737 		struct ip6_sf_list *psf;
738 
739 		pmc->mca_tomb = im->mca_tomb;
740 		pmc->mca_sources = im->mca_sources;
741 		im->mca_tomb = im->mca_sources = NULL;
742 		for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
743 			psf->sf_crcount = pmc->mca_crcount;
744 	}
745 	spin_unlock_bh(&im->mca_lock);
746 
747 	spin_lock_bh(&idev->mc_lock);
748 	pmc->next = idev->mc_tomb;
749 	idev->mc_tomb = pmc;
750 	spin_unlock_bh(&idev->mc_lock);
751 }
752 
753 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
754 {
755 	struct ifmcaddr6 *pmc, *pmc_prev;
756 	struct ip6_sf_list *psf, *psf_next;
757 
758 	spin_lock_bh(&idev->mc_lock);
759 	pmc_prev = NULL;
760 	for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
761 		if (ipv6_addr_equal(&pmc->mca_addr, pmca))
762 			break;
763 		pmc_prev = pmc;
764 	}
765 	if (pmc) {
766 		if (pmc_prev)
767 			pmc_prev->next = pmc->next;
768 		else
769 			idev->mc_tomb = pmc->next;
770 	}
771 	spin_unlock_bh(&idev->mc_lock);
772 
773 	if (pmc) {
774 		for (psf=pmc->mca_tomb; psf; psf=psf_next) {
775 			psf_next = psf->sf_next;
776 			kfree(psf);
777 		}
778 		in6_dev_put(pmc->idev);
779 		kfree(pmc);
780 	}
781 }
782 
783 static void mld_clear_delrec(struct inet6_dev *idev)
784 {
785 	struct ifmcaddr6 *pmc, *nextpmc;
786 
787 	spin_lock_bh(&idev->mc_lock);
788 	pmc = idev->mc_tomb;
789 	idev->mc_tomb = NULL;
790 	spin_unlock_bh(&idev->mc_lock);
791 
792 	for (; pmc; pmc = nextpmc) {
793 		nextpmc = pmc->next;
794 		ip6_mc_clear_src(pmc);
795 		in6_dev_put(pmc->idev);
796 		kfree(pmc);
797 	}
798 
799 	/* clear dead sources, too */
800 	read_lock_bh(&idev->lock);
801 	for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
802 		struct ip6_sf_list *psf, *psf_next;
803 
804 		spin_lock_bh(&pmc->mca_lock);
805 		psf = pmc->mca_tomb;
806 		pmc->mca_tomb = NULL;
807 		spin_unlock_bh(&pmc->mca_lock);
808 		for (; psf; psf=psf_next) {
809 			psf_next = psf->sf_next;
810 			kfree(psf);
811 		}
812 	}
813 	read_unlock_bh(&idev->lock);
814 }
815 
816 
817 /*
818  *	device multicast group inc (add if not found)
819  */
820 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
821 {
822 	struct ifmcaddr6 *mc;
823 	struct inet6_dev *idev;
824 
825 	/* we need to take a reference on idev */
826 	idev = in6_dev_get(dev);
827 
828 	if (idev == NULL)
829 		return -EINVAL;
830 
831 	write_lock_bh(&idev->lock);
832 	if (idev->dead) {
833 		write_unlock_bh(&idev->lock);
834 		in6_dev_put(idev);
835 		return -ENODEV;
836 	}
837 
838 	for (mc = idev->mc_list; mc; mc = mc->next) {
839 		if (ipv6_addr_equal(&mc->mca_addr, addr)) {
840 			mc->mca_users++;
841 			write_unlock_bh(&idev->lock);
842 			ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
843 				NULL, 0);
844 			in6_dev_put(idev);
845 			return 0;
846 		}
847 	}
848 
849 	/*
850 	 *	not found: create a new one.
851 	 */
852 
853 	mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
854 
855 	if (mc == NULL) {
856 		write_unlock_bh(&idev->lock);
857 		in6_dev_put(idev);
858 		return -ENOMEM;
859 	}
860 
861 	setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
862 
863 	mc->mca_addr = *addr;
864 	mc->idev = idev; /* (reference taken) */
865 	mc->mca_users = 1;
866 	/* mca_stamp should be updated upon changes */
867 	mc->mca_cstamp = mc->mca_tstamp = jiffies;
868 	atomic_set(&mc->mca_refcnt, 2);
869 	spin_lock_init(&mc->mca_lock);
870 
871 	/* initial mode is (EX, empty) */
872 	mc->mca_sfmode = MCAST_EXCLUDE;
873 	mc->mca_sfcount[MCAST_EXCLUDE] = 1;
874 
875 	if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
876 	    IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
877 		mc->mca_flags |= MAF_NOREPORT;
878 
879 	mc->next = idev->mc_list;
880 	idev->mc_list = mc;
881 	write_unlock_bh(&idev->lock);
882 
883 	mld_del_delrec(idev, &mc->mca_addr);
884 	igmp6_group_added(mc);
885 	ma_put(mc);
886 	return 0;
887 }
888 
889 /*
890  *	device multicast group del
891  */
892 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
893 {
894 	struct ifmcaddr6 *ma, **map;
895 
896 	write_lock_bh(&idev->lock);
897 	for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
898 		if (ipv6_addr_equal(&ma->mca_addr, addr)) {
899 			if (--ma->mca_users == 0) {
900 				*map = ma->next;
901 				write_unlock_bh(&idev->lock);
902 
903 				igmp6_group_dropped(ma);
904 
905 				ma_put(ma);
906 				return 0;
907 			}
908 			write_unlock_bh(&idev->lock);
909 			return 0;
910 		}
911 	}
912 	write_unlock_bh(&idev->lock);
913 
914 	return -ENOENT;
915 }
916 
917 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
918 {
919 	struct inet6_dev *idev;
920 	int err;
921 
922 	rcu_read_lock();
923 
924 	idev = __in6_dev_get(dev);
925 	if (!idev)
926 		err = -ENODEV;
927 	else
928 		err = __ipv6_dev_mc_dec(idev, addr);
929 
930 	rcu_read_unlock();
931 	return err;
932 }
933 
934 /*
935  * identify MLD packets for MLD filter exceptions
936  */
937 bool ipv6_is_mld(struct sk_buff *skb, int nexthdr)
938 {
939 	struct icmp6hdr *pic;
940 
941 	if (nexthdr != IPPROTO_ICMPV6)
942 		return false;
943 
944 	if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
945 		return false;
946 
947 	pic = icmp6_hdr(skb);
948 
949 	switch (pic->icmp6_type) {
950 	case ICMPV6_MGM_QUERY:
951 	case ICMPV6_MGM_REPORT:
952 	case ICMPV6_MGM_REDUCTION:
953 	case ICMPV6_MLD2_REPORT:
954 		return true;
955 	default:
956 		break;
957 	}
958 	return false;
959 }
960 
961 /*
962  *	check if the interface/address pair is valid
963  */
964 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
965 			 const struct in6_addr *src_addr)
966 {
967 	struct inet6_dev *idev;
968 	struct ifmcaddr6 *mc;
969 	bool rv = false;
970 
971 	rcu_read_lock();
972 	idev = __in6_dev_get(dev);
973 	if (idev) {
974 		read_lock_bh(&idev->lock);
975 		for (mc = idev->mc_list; mc; mc=mc->next) {
976 			if (ipv6_addr_equal(&mc->mca_addr, group))
977 				break;
978 		}
979 		if (mc) {
980 			if (src_addr && !ipv6_addr_any(src_addr)) {
981 				struct ip6_sf_list *psf;
982 
983 				spin_lock_bh(&mc->mca_lock);
984 				for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
985 					if (ipv6_addr_equal(&psf->sf_addr, src_addr))
986 						break;
987 				}
988 				if (psf)
989 					rv = psf->sf_count[MCAST_INCLUDE] ||
990 						psf->sf_count[MCAST_EXCLUDE] !=
991 						mc->mca_sfcount[MCAST_EXCLUDE];
992 				else
993 					rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
994 				spin_unlock_bh(&mc->mca_lock);
995 			} else
996 				rv = true; /* don't filter unspecified source */
997 		}
998 		read_unlock_bh(&idev->lock);
999 	}
1000 	rcu_read_unlock();
1001 	return rv;
1002 }
1003 
1004 static void mld_gq_start_timer(struct inet6_dev *idev)
1005 {
1006 	int tv = net_random() % idev->mc_maxdelay;
1007 
1008 	idev->mc_gq_running = 1;
1009 	if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1010 		in6_dev_hold(idev);
1011 }
1012 
1013 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1014 {
1015 	int tv = net_random() % delay;
1016 
1017 	if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1018 		in6_dev_hold(idev);
1019 }
1020 
1021 /*
1022  *	IGMP handling (alias multicast ICMPv6 messages)
1023  */
1024 
1025 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1026 {
1027 	unsigned long delay = resptime;
1028 
1029 	/* Do not start timer for these addresses */
1030 	if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1031 	    IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1032 		return;
1033 
1034 	if (del_timer(&ma->mca_timer)) {
1035 		atomic_dec(&ma->mca_refcnt);
1036 		delay = ma->mca_timer.expires - jiffies;
1037 	}
1038 
1039 	if (delay >= resptime) {
1040 		if (resptime)
1041 			delay = net_random() % resptime;
1042 		else
1043 			delay = 1;
1044 	}
1045 	ma->mca_timer.expires = jiffies + delay;
1046 	if (!mod_timer(&ma->mca_timer, jiffies + delay))
1047 		atomic_inc(&ma->mca_refcnt);
1048 	ma->mca_flags |= MAF_TIMER_RUNNING;
1049 }
1050 
1051 /* mark EXCLUDE-mode sources */
1052 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1053 			     const struct in6_addr *srcs)
1054 {
1055 	struct ip6_sf_list *psf;
1056 	int i, scount;
1057 
1058 	scount = 0;
1059 	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1060 		if (scount == nsrcs)
1061 			break;
1062 		for (i=0; i<nsrcs; i++) {
1063 			/* skip inactive filters */
1064 			if (psf->sf_count[MCAST_INCLUDE] ||
1065 			    pmc->mca_sfcount[MCAST_EXCLUDE] !=
1066 			    psf->sf_count[MCAST_EXCLUDE])
1067 				break;
1068 			if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1069 				scount++;
1070 				break;
1071 			}
1072 		}
1073 	}
1074 	pmc->mca_flags &= ~MAF_GSQUERY;
1075 	if (scount == nsrcs)	/* all sources excluded */
1076 		return false;
1077 	return true;
1078 }
1079 
1080 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1081 			    const struct in6_addr *srcs)
1082 {
1083 	struct ip6_sf_list *psf;
1084 	int i, scount;
1085 
1086 	if (pmc->mca_sfmode == MCAST_EXCLUDE)
1087 		return mld_xmarksources(pmc, nsrcs, srcs);
1088 
1089 	/* mark INCLUDE-mode sources */
1090 
1091 	scount = 0;
1092 	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1093 		if (scount == nsrcs)
1094 			break;
1095 		for (i=0; i<nsrcs; i++) {
1096 			if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1097 				psf->sf_gsresp = 1;
1098 				scount++;
1099 				break;
1100 			}
1101 		}
1102 	}
1103 	if (!scount) {
1104 		pmc->mca_flags &= ~MAF_GSQUERY;
1105 		return false;
1106 	}
1107 	pmc->mca_flags |= MAF_GSQUERY;
1108 	return true;
1109 }
1110 
1111 /* called with rcu_read_lock() */
1112 int igmp6_event_query(struct sk_buff *skb)
1113 {
1114 	struct mld2_query *mlh2 = NULL;
1115 	struct ifmcaddr6 *ma;
1116 	const struct in6_addr *group;
1117 	unsigned long max_delay;
1118 	struct inet6_dev *idev;
1119 	struct mld_msg *mld;
1120 	int group_type;
1121 	int mark = 0;
1122 	int len;
1123 
1124 	if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1125 		return -EINVAL;
1126 
1127 	/* compute payload length excluding extension headers */
1128 	len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1129 	len -= skb_network_header_len(skb);
1130 
1131 	/* Drop queries with not link local source */
1132 	if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1133 		return -EINVAL;
1134 
1135 	idev = __in6_dev_get(skb->dev);
1136 
1137 	if (idev == NULL)
1138 		return 0;
1139 
1140 	mld = (struct mld_msg *)icmp6_hdr(skb);
1141 	group = &mld->mld_mca;
1142 	group_type = ipv6_addr_type(group);
1143 
1144 	if (group_type != IPV6_ADDR_ANY &&
1145 	    !(group_type&IPV6_ADDR_MULTICAST))
1146 		return -EINVAL;
1147 
1148 	if (len == 24) {
1149 		int switchback;
1150 		/* MLDv1 router present */
1151 
1152 		/* Translate milliseconds to jiffies */
1153 		max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1154 
1155 		switchback = (idev->mc_qrv + 1) * max_delay;
1156 		idev->mc_v1_seen = jiffies + switchback;
1157 
1158 		/* cancel the interface change timer */
1159 		idev->mc_ifc_count = 0;
1160 		if (del_timer(&idev->mc_ifc_timer))
1161 			__in6_dev_put(idev);
1162 		/* clear deleted report items */
1163 		mld_clear_delrec(idev);
1164 	} else if (len >= 28) {
1165 		int srcs_offset = sizeof(struct mld2_query) -
1166 				  sizeof(struct icmp6hdr);
1167 		if (!pskb_may_pull(skb, srcs_offset))
1168 			return -EINVAL;
1169 
1170 		mlh2 = (struct mld2_query *)skb_transport_header(skb);
1171 		max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1172 		if (!max_delay)
1173 			max_delay = 1;
1174 		idev->mc_maxdelay = max_delay;
1175 		if (mlh2->mld2q_qrv)
1176 			idev->mc_qrv = mlh2->mld2q_qrv;
1177 		if (group_type == IPV6_ADDR_ANY) { /* general query */
1178 			if (mlh2->mld2q_nsrcs)
1179 				return -EINVAL; /* no sources allowed */
1180 
1181 			mld_gq_start_timer(idev);
1182 			return 0;
1183 		}
1184 		/* mark sources to include, if group & source-specific */
1185 		if (mlh2->mld2q_nsrcs != 0) {
1186 			if (!pskb_may_pull(skb, srcs_offset +
1187 			    ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1188 				return -EINVAL;
1189 
1190 			mlh2 = (struct mld2_query *)skb_transport_header(skb);
1191 			mark = 1;
1192 		}
1193 	} else
1194 		return -EINVAL;
1195 
1196 	read_lock_bh(&idev->lock);
1197 	if (group_type == IPV6_ADDR_ANY) {
1198 		for (ma = idev->mc_list; ma; ma=ma->next) {
1199 			spin_lock_bh(&ma->mca_lock);
1200 			igmp6_group_queried(ma, max_delay);
1201 			spin_unlock_bh(&ma->mca_lock);
1202 		}
1203 	} else {
1204 		for (ma = idev->mc_list; ma; ma=ma->next) {
1205 			if (!ipv6_addr_equal(group, &ma->mca_addr))
1206 				continue;
1207 			spin_lock_bh(&ma->mca_lock);
1208 			if (ma->mca_flags & MAF_TIMER_RUNNING) {
1209 				/* gsquery <- gsquery && mark */
1210 				if (!mark)
1211 					ma->mca_flags &= ~MAF_GSQUERY;
1212 			} else {
1213 				/* gsquery <- mark */
1214 				if (mark)
1215 					ma->mca_flags |= MAF_GSQUERY;
1216 				else
1217 					ma->mca_flags &= ~MAF_GSQUERY;
1218 			}
1219 			if (!(ma->mca_flags & MAF_GSQUERY) ||
1220 			    mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1221 				igmp6_group_queried(ma, max_delay);
1222 			spin_unlock_bh(&ma->mca_lock);
1223 			break;
1224 		}
1225 	}
1226 	read_unlock_bh(&idev->lock);
1227 
1228 	return 0;
1229 }
1230 
1231 /* called with rcu_read_lock() */
1232 int igmp6_event_report(struct sk_buff *skb)
1233 {
1234 	struct ifmcaddr6 *ma;
1235 	struct inet6_dev *idev;
1236 	struct mld_msg *mld;
1237 	int addr_type;
1238 
1239 	/* Our own report looped back. Ignore it. */
1240 	if (skb->pkt_type == PACKET_LOOPBACK)
1241 		return 0;
1242 
1243 	/* send our report if the MC router may not have heard this report */
1244 	if (skb->pkt_type != PACKET_MULTICAST &&
1245 	    skb->pkt_type != PACKET_BROADCAST)
1246 		return 0;
1247 
1248 	if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1249 		return -EINVAL;
1250 
1251 	mld = (struct mld_msg *)icmp6_hdr(skb);
1252 
1253 	/* Drop reports with not link local source */
1254 	addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1255 	if (addr_type != IPV6_ADDR_ANY &&
1256 	    !(addr_type&IPV6_ADDR_LINKLOCAL))
1257 		return -EINVAL;
1258 
1259 	idev = __in6_dev_get(skb->dev);
1260 	if (idev == NULL)
1261 		return -ENODEV;
1262 
1263 	/*
1264 	 *	Cancel the timer for this group
1265 	 */
1266 
1267 	read_lock_bh(&idev->lock);
1268 	for (ma = idev->mc_list; ma; ma=ma->next) {
1269 		if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1270 			spin_lock(&ma->mca_lock);
1271 			if (del_timer(&ma->mca_timer))
1272 				atomic_dec(&ma->mca_refcnt);
1273 			ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1274 			spin_unlock(&ma->mca_lock);
1275 			break;
1276 		}
1277 	}
1278 	read_unlock_bh(&idev->lock);
1279 	return 0;
1280 }
1281 
1282 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1283 		  int gdeleted, int sdeleted)
1284 {
1285 	switch (type) {
1286 	case MLD2_MODE_IS_INCLUDE:
1287 	case MLD2_MODE_IS_EXCLUDE:
1288 		if (gdeleted || sdeleted)
1289 			return false;
1290 		if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1291 			if (pmc->mca_sfmode == MCAST_INCLUDE)
1292 				return true;
1293 			/* don't include if this source is excluded
1294 			 * in all filters
1295 			 */
1296 			if (psf->sf_count[MCAST_INCLUDE])
1297 				return type == MLD2_MODE_IS_INCLUDE;
1298 			return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1299 				psf->sf_count[MCAST_EXCLUDE];
1300 		}
1301 		return false;
1302 	case MLD2_CHANGE_TO_INCLUDE:
1303 		if (gdeleted || sdeleted)
1304 			return false;
1305 		return psf->sf_count[MCAST_INCLUDE] != 0;
1306 	case MLD2_CHANGE_TO_EXCLUDE:
1307 		if (gdeleted || sdeleted)
1308 			return false;
1309 		if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1310 		    psf->sf_count[MCAST_INCLUDE])
1311 			return false;
1312 		return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1313 			psf->sf_count[MCAST_EXCLUDE];
1314 	case MLD2_ALLOW_NEW_SOURCES:
1315 		if (gdeleted || !psf->sf_crcount)
1316 			return false;
1317 		return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1318 	case MLD2_BLOCK_OLD_SOURCES:
1319 		if (pmc->mca_sfmode == MCAST_INCLUDE)
1320 			return gdeleted || (psf->sf_crcount && sdeleted);
1321 		return psf->sf_crcount && !gdeleted && !sdeleted;
1322 	}
1323 	return false;
1324 }
1325 
1326 static int
1327 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1328 {
1329 	struct ip6_sf_list *psf;
1330 	int scount = 0;
1331 
1332 	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1333 		if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1334 			continue;
1335 		scount++;
1336 	}
1337 	return scount;
1338 }
1339 
1340 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1341 {
1342 	struct net *net = dev_net(dev);
1343 	struct sock *sk = net->ipv6.igmp_sk;
1344 	struct sk_buff *skb;
1345 	struct mld2_report *pmr;
1346 	struct in6_addr addr_buf;
1347 	const struct in6_addr *saddr;
1348 	int hlen = LL_RESERVED_SPACE(dev);
1349 	int tlen = dev->needed_tailroom;
1350 	int err;
1351 	u8 ra[8] = { IPPROTO_ICMPV6, 0,
1352 		     IPV6_TLV_ROUTERALERT, 2, 0, 0,
1353 		     IPV6_TLV_PADN, 0 };
1354 
1355 	/* we assume size > sizeof(ra) here */
1356 	size += hlen + tlen;
1357 	/* limit our allocations to order-0 page */
1358 	size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1359 	skb = sock_alloc_send_skb(sk, size, 1, &err);
1360 
1361 	if (!skb)
1362 		return NULL;
1363 
1364 	skb_reserve(skb, hlen);
1365 
1366 	if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1367 		/* <draft-ietf-magma-mld-source-05.txt>:
1368 		 * use unspecified address as the source address
1369 		 * when a valid link-local address is not available.
1370 		 */
1371 		saddr = &in6addr_any;
1372 	} else
1373 		saddr = &addr_buf;
1374 
1375 	ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1376 
1377 	memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1378 
1379 	skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1380 	skb_put(skb, sizeof(*pmr));
1381 	pmr = (struct mld2_report *)skb_transport_header(skb);
1382 	pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1383 	pmr->mld2r_resv1 = 0;
1384 	pmr->mld2r_cksum = 0;
1385 	pmr->mld2r_resv2 = 0;
1386 	pmr->mld2r_ngrec = 0;
1387 	return skb;
1388 }
1389 
1390 static void mld_sendpack(struct sk_buff *skb)
1391 {
1392 	struct ipv6hdr *pip6 = ipv6_hdr(skb);
1393 	struct mld2_report *pmr =
1394 			      (struct mld2_report *)skb_transport_header(skb);
1395 	int payload_len, mldlen;
1396 	struct inet6_dev *idev;
1397 	struct net *net = dev_net(skb->dev);
1398 	int err;
1399 	struct flowi6 fl6;
1400 	struct dst_entry *dst;
1401 
1402 	rcu_read_lock();
1403 	idev = __in6_dev_get(skb->dev);
1404 	IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1405 
1406 	payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1407 	mldlen = skb->tail - skb->transport_header;
1408 	pip6->payload_len = htons(payload_len);
1409 
1410 	pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1411 					   IPPROTO_ICMPV6,
1412 					   csum_partial(skb_transport_header(skb),
1413 							mldlen, 0));
1414 
1415 	icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1416 			 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1417 			 skb->dev->ifindex);
1418 	dst = icmp6_dst_alloc(skb->dev, NULL, &fl6);
1419 
1420 	err = 0;
1421 	if (IS_ERR(dst)) {
1422 		err = PTR_ERR(dst);
1423 		dst = NULL;
1424 	}
1425 	skb_dst_set(skb, dst);
1426 	if (err)
1427 		goto err_out;
1428 
1429 	payload_len = skb->len;
1430 
1431 	err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1432 		      dst_output);
1433 out:
1434 	if (!err) {
1435 		ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1436 		ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1437 		IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1438 	} else
1439 		IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1440 
1441 	rcu_read_unlock();
1442 	return;
1443 
1444 err_out:
1445 	kfree_skb(skb);
1446 	goto out;
1447 }
1448 
1449 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1450 {
1451 	return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1452 }
1453 
1454 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1455 	int type, struct mld2_grec **ppgr)
1456 {
1457 	struct net_device *dev = pmc->idev->dev;
1458 	struct mld2_report *pmr;
1459 	struct mld2_grec *pgr;
1460 
1461 	if (!skb)
1462 		skb = mld_newpack(dev, dev->mtu);
1463 	if (!skb)
1464 		return NULL;
1465 	pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1466 	pgr->grec_type = type;
1467 	pgr->grec_auxwords = 0;
1468 	pgr->grec_nsrcs = 0;
1469 	pgr->grec_mca = pmc->mca_addr;	/* structure copy */
1470 	pmr = (struct mld2_report *)skb_transport_header(skb);
1471 	pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1472 	*ppgr = pgr;
1473 	return skb;
1474 }
1475 
1476 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1477 	skb_tailroom(skb)) : 0)
1478 
1479 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1480 	int type, int gdeleted, int sdeleted)
1481 {
1482 	struct net_device *dev = pmc->idev->dev;
1483 	struct mld2_report *pmr;
1484 	struct mld2_grec *pgr = NULL;
1485 	struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1486 	int scount, stotal, first, isquery, truncate;
1487 
1488 	if (pmc->mca_flags & MAF_NOREPORT)
1489 		return skb;
1490 
1491 	isquery = type == MLD2_MODE_IS_INCLUDE ||
1492 		  type == MLD2_MODE_IS_EXCLUDE;
1493 	truncate = type == MLD2_MODE_IS_EXCLUDE ||
1494 		    type == MLD2_CHANGE_TO_EXCLUDE;
1495 
1496 	stotal = scount = 0;
1497 
1498 	psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1499 
1500 	if (!*psf_list)
1501 		goto empty_source;
1502 
1503 	pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1504 
1505 	/* EX and TO_EX get a fresh packet, if needed */
1506 	if (truncate) {
1507 		if (pmr && pmr->mld2r_ngrec &&
1508 		    AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1509 			if (skb)
1510 				mld_sendpack(skb);
1511 			skb = mld_newpack(dev, dev->mtu);
1512 		}
1513 	}
1514 	first = 1;
1515 	psf_prev = NULL;
1516 	for (psf=*psf_list; psf; psf=psf_next) {
1517 		struct in6_addr *psrc;
1518 
1519 		psf_next = psf->sf_next;
1520 
1521 		if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1522 			psf_prev = psf;
1523 			continue;
1524 		}
1525 
1526 		/* clear marks on query responses */
1527 		if (isquery)
1528 			psf->sf_gsresp = 0;
1529 
1530 		if (AVAILABLE(skb) < sizeof(*psrc) +
1531 		    first*sizeof(struct mld2_grec)) {
1532 			if (truncate && !first)
1533 				break;	 /* truncate these */
1534 			if (pgr)
1535 				pgr->grec_nsrcs = htons(scount);
1536 			if (skb)
1537 				mld_sendpack(skb);
1538 			skb = mld_newpack(dev, dev->mtu);
1539 			first = 1;
1540 			scount = 0;
1541 		}
1542 		if (first) {
1543 			skb = add_grhead(skb, pmc, type, &pgr);
1544 			first = 0;
1545 		}
1546 		if (!skb)
1547 			return NULL;
1548 		psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1549 		*psrc = psf->sf_addr;
1550 		scount++; stotal++;
1551 		if ((type == MLD2_ALLOW_NEW_SOURCES ||
1552 		     type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1553 			psf->sf_crcount--;
1554 			if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1555 				if (psf_prev)
1556 					psf_prev->sf_next = psf->sf_next;
1557 				else
1558 					*psf_list = psf->sf_next;
1559 				kfree(psf);
1560 				continue;
1561 			}
1562 		}
1563 		psf_prev = psf;
1564 	}
1565 
1566 empty_source:
1567 	if (!stotal) {
1568 		if (type == MLD2_ALLOW_NEW_SOURCES ||
1569 		    type == MLD2_BLOCK_OLD_SOURCES)
1570 			return skb;
1571 		if (pmc->mca_crcount || isquery) {
1572 			/* make sure we have room for group header */
1573 			if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1574 				mld_sendpack(skb);
1575 				skb = NULL; /* add_grhead will get a new one */
1576 			}
1577 			skb = add_grhead(skb, pmc, type, &pgr);
1578 		}
1579 	}
1580 	if (pgr)
1581 		pgr->grec_nsrcs = htons(scount);
1582 
1583 	if (isquery)
1584 		pmc->mca_flags &= ~MAF_GSQUERY;	/* clear query state */
1585 	return skb;
1586 }
1587 
1588 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1589 {
1590 	struct sk_buff *skb = NULL;
1591 	int type;
1592 
1593 	if (!pmc) {
1594 		read_lock_bh(&idev->lock);
1595 		for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1596 			if (pmc->mca_flags & MAF_NOREPORT)
1597 				continue;
1598 			spin_lock_bh(&pmc->mca_lock);
1599 			if (pmc->mca_sfcount[MCAST_EXCLUDE])
1600 				type = MLD2_MODE_IS_EXCLUDE;
1601 			else
1602 				type = MLD2_MODE_IS_INCLUDE;
1603 			skb = add_grec(skb, pmc, type, 0, 0);
1604 			spin_unlock_bh(&pmc->mca_lock);
1605 		}
1606 		read_unlock_bh(&idev->lock);
1607 	} else {
1608 		spin_lock_bh(&pmc->mca_lock);
1609 		if (pmc->mca_sfcount[MCAST_EXCLUDE])
1610 			type = MLD2_MODE_IS_EXCLUDE;
1611 		else
1612 			type = MLD2_MODE_IS_INCLUDE;
1613 		skb = add_grec(skb, pmc, type, 0, 0);
1614 		spin_unlock_bh(&pmc->mca_lock);
1615 	}
1616 	if (skb)
1617 		mld_sendpack(skb);
1618 }
1619 
1620 /*
1621  * remove zero-count source records from a source filter list
1622  */
1623 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1624 {
1625 	struct ip6_sf_list *psf_prev, *psf_next, *psf;
1626 
1627 	psf_prev = NULL;
1628 	for (psf=*ppsf; psf; psf = psf_next) {
1629 		psf_next = psf->sf_next;
1630 		if (psf->sf_crcount == 0) {
1631 			if (psf_prev)
1632 				psf_prev->sf_next = psf->sf_next;
1633 			else
1634 				*ppsf = psf->sf_next;
1635 			kfree(psf);
1636 		} else
1637 			psf_prev = psf;
1638 	}
1639 }
1640 
1641 static void mld_send_cr(struct inet6_dev *idev)
1642 {
1643 	struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1644 	struct sk_buff *skb = NULL;
1645 	int type, dtype;
1646 
1647 	read_lock_bh(&idev->lock);
1648 	spin_lock(&idev->mc_lock);
1649 
1650 	/* deleted MCA's */
1651 	pmc_prev = NULL;
1652 	for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1653 		pmc_next = pmc->next;
1654 		if (pmc->mca_sfmode == MCAST_INCLUDE) {
1655 			type = MLD2_BLOCK_OLD_SOURCES;
1656 			dtype = MLD2_BLOCK_OLD_SOURCES;
1657 			skb = add_grec(skb, pmc, type, 1, 0);
1658 			skb = add_grec(skb, pmc, dtype, 1, 1);
1659 		}
1660 		if (pmc->mca_crcount) {
1661 			if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1662 				type = MLD2_CHANGE_TO_INCLUDE;
1663 				skb = add_grec(skb, pmc, type, 1, 0);
1664 			}
1665 			pmc->mca_crcount--;
1666 			if (pmc->mca_crcount == 0) {
1667 				mld_clear_zeros(&pmc->mca_tomb);
1668 				mld_clear_zeros(&pmc->mca_sources);
1669 			}
1670 		}
1671 		if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1672 		    !pmc->mca_sources) {
1673 			if (pmc_prev)
1674 				pmc_prev->next = pmc_next;
1675 			else
1676 				idev->mc_tomb = pmc_next;
1677 			in6_dev_put(pmc->idev);
1678 			kfree(pmc);
1679 		} else
1680 			pmc_prev = pmc;
1681 	}
1682 	spin_unlock(&idev->mc_lock);
1683 
1684 	/* change recs */
1685 	for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1686 		spin_lock_bh(&pmc->mca_lock);
1687 		if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1688 			type = MLD2_BLOCK_OLD_SOURCES;
1689 			dtype = MLD2_ALLOW_NEW_SOURCES;
1690 		} else {
1691 			type = MLD2_ALLOW_NEW_SOURCES;
1692 			dtype = MLD2_BLOCK_OLD_SOURCES;
1693 		}
1694 		skb = add_grec(skb, pmc, type, 0, 0);
1695 		skb = add_grec(skb, pmc, dtype, 0, 1);	/* deleted sources */
1696 
1697 		/* filter mode changes */
1698 		if (pmc->mca_crcount) {
1699 			if (pmc->mca_sfmode == MCAST_EXCLUDE)
1700 				type = MLD2_CHANGE_TO_EXCLUDE;
1701 			else
1702 				type = MLD2_CHANGE_TO_INCLUDE;
1703 			skb = add_grec(skb, pmc, type, 0, 0);
1704 			pmc->mca_crcount--;
1705 		}
1706 		spin_unlock_bh(&pmc->mca_lock);
1707 	}
1708 	read_unlock_bh(&idev->lock);
1709 	if (!skb)
1710 		return;
1711 	(void) mld_sendpack(skb);
1712 }
1713 
1714 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1715 {
1716 	struct net *net = dev_net(dev);
1717 	struct sock *sk = net->ipv6.igmp_sk;
1718 	struct inet6_dev *idev;
1719 	struct sk_buff *skb;
1720 	struct mld_msg *hdr;
1721 	const struct in6_addr *snd_addr, *saddr;
1722 	struct in6_addr addr_buf;
1723 	int hlen = LL_RESERVED_SPACE(dev);
1724 	int tlen = dev->needed_tailroom;
1725 	int err, len, payload_len, full_len;
1726 	u8 ra[8] = { IPPROTO_ICMPV6, 0,
1727 		     IPV6_TLV_ROUTERALERT, 2, 0, 0,
1728 		     IPV6_TLV_PADN, 0 };
1729 	struct flowi6 fl6;
1730 	struct dst_entry *dst;
1731 
1732 	if (type == ICMPV6_MGM_REDUCTION)
1733 		snd_addr = &in6addr_linklocal_allrouters;
1734 	else
1735 		snd_addr = addr;
1736 
1737 	len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1738 	payload_len = len + sizeof(ra);
1739 	full_len = sizeof(struct ipv6hdr) + payload_len;
1740 
1741 	rcu_read_lock();
1742 	IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1743 		      IPSTATS_MIB_OUT, full_len);
1744 	rcu_read_unlock();
1745 
1746 	skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1747 
1748 	if (skb == NULL) {
1749 		rcu_read_lock();
1750 		IP6_INC_STATS(net, __in6_dev_get(dev),
1751 			      IPSTATS_MIB_OUTDISCARDS);
1752 		rcu_read_unlock();
1753 		return;
1754 	}
1755 
1756 	skb_reserve(skb, hlen);
1757 
1758 	if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1759 		/* <draft-ietf-magma-mld-source-05.txt>:
1760 		 * use unspecified address as the source address
1761 		 * when a valid link-local address is not available.
1762 		 */
1763 		saddr = &in6addr_any;
1764 	} else
1765 		saddr = &addr_buf;
1766 
1767 	ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1768 
1769 	memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1770 
1771 	hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1772 	memset(hdr, 0, sizeof(struct mld_msg));
1773 	hdr->mld_type = type;
1774 	hdr->mld_mca = *addr;
1775 
1776 	hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1777 					 IPPROTO_ICMPV6,
1778 					 csum_partial(hdr, len, 0));
1779 
1780 	rcu_read_lock();
1781 	idev = __in6_dev_get(skb->dev);
1782 
1783 	icmpv6_flow_init(sk, &fl6, type,
1784 			 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1785 			 skb->dev->ifindex);
1786 	dst = icmp6_dst_alloc(skb->dev, NULL, &fl6);
1787 	if (IS_ERR(dst)) {
1788 		err = PTR_ERR(dst);
1789 		goto err_out;
1790 	}
1791 
1792 	skb_dst_set(skb, dst);
1793 	err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1794 		      dst_output);
1795 out:
1796 	if (!err) {
1797 		ICMP6MSGOUT_INC_STATS(net, idev, type);
1798 		ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1799 		IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1800 	} else
1801 		IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1802 
1803 	rcu_read_unlock();
1804 	return;
1805 
1806 err_out:
1807 	kfree_skb(skb);
1808 	goto out;
1809 }
1810 
1811 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1812 	const struct in6_addr *psfsrc)
1813 {
1814 	struct ip6_sf_list *psf, *psf_prev;
1815 	int rv = 0;
1816 
1817 	psf_prev = NULL;
1818 	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1819 		if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1820 			break;
1821 		psf_prev = psf;
1822 	}
1823 	if (!psf || psf->sf_count[sfmode] == 0) {
1824 		/* source filter not found, or count wrong =>  bug */
1825 		return -ESRCH;
1826 	}
1827 	psf->sf_count[sfmode]--;
1828 	if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1829 		struct inet6_dev *idev = pmc->idev;
1830 
1831 		/* no more filters for this source */
1832 		if (psf_prev)
1833 			psf_prev->sf_next = psf->sf_next;
1834 		else
1835 			pmc->mca_sources = psf->sf_next;
1836 		if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1837 		    !MLD_V1_SEEN(idev)) {
1838 			psf->sf_crcount = idev->mc_qrv;
1839 			psf->sf_next = pmc->mca_tomb;
1840 			pmc->mca_tomb = psf;
1841 			rv = 1;
1842 		} else
1843 			kfree(psf);
1844 	}
1845 	return rv;
1846 }
1847 
1848 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1849 			  int sfmode, int sfcount, const struct in6_addr *psfsrc,
1850 			  int delta)
1851 {
1852 	struct ifmcaddr6 *pmc;
1853 	int	changerec = 0;
1854 	int	i, err;
1855 
1856 	if (!idev)
1857 		return -ENODEV;
1858 	read_lock_bh(&idev->lock);
1859 	for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1860 		if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1861 			break;
1862 	}
1863 	if (!pmc) {
1864 		/* MCA not found?? bug */
1865 		read_unlock_bh(&idev->lock);
1866 		return -ESRCH;
1867 	}
1868 	spin_lock_bh(&pmc->mca_lock);
1869 	sf_markstate(pmc);
1870 	if (!delta) {
1871 		if (!pmc->mca_sfcount[sfmode]) {
1872 			spin_unlock_bh(&pmc->mca_lock);
1873 			read_unlock_bh(&idev->lock);
1874 			return -EINVAL;
1875 		}
1876 		pmc->mca_sfcount[sfmode]--;
1877 	}
1878 	err = 0;
1879 	for (i=0; i<sfcount; i++) {
1880 		int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1881 
1882 		changerec |= rv > 0;
1883 		if (!err && rv < 0)
1884 			err = rv;
1885 	}
1886 	if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1887 	    pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1888 	    pmc->mca_sfcount[MCAST_INCLUDE]) {
1889 		struct ip6_sf_list *psf;
1890 
1891 		/* filter mode change */
1892 		pmc->mca_sfmode = MCAST_INCLUDE;
1893 		pmc->mca_crcount = idev->mc_qrv;
1894 		idev->mc_ifc_count = pmc->mca_crcount;
1895 		for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1896 			psf->sf_crcount = 0;
1897 		mld_ifc_event(pmc->idev);
1898 	} else if (sf_setstate(pmc) || changerec)
1899 		mld_ifc_event(pmc->idev);
1900 	spin_unlock_bh(&pmc->mca_lock);
1901 	read_unlock_bh(&idev->lock);
1902 	return err;
1903 }
1904 
1905 /*
1906  * Add multicast single-source filter to the interface list
1907  */
1908 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1909 	const struct in6_addr *psfsrc)
1910 {
1911 	struct ip6_sf_list *psf, *psf_prev;
1912 
1913 	psf_prev = NULL;
1914 	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1915 		if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1916 			break;
1917 		psf_prev = psf;
1918 	}
1919 	if (!psf) {
1920 		psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1921 		if (!psf)
1922 			return -ENOBUFS;
1923 
1924 		psf->sf_addr = *psfsrc;
1925 		if (psf_prev) {
1926 			psf_prev->sf_next = psf;
1927 		} else
1928 			pmc->mca_sources = psf;
1929 	}
1930 	psf->sf_count[sfmode]++;
1931 	return 0;
1932 }
1933 
1934 static void sf_markstate(struct ifmcaddr6 *pmc)
1935 {
1936 	struct ip6_sf_list *psf;
1937 	int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1938 
1939 	for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1940 		if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1941 			psf->sf_oldin = mca_xcount ==
1942 				psf->sf_count[MCAST_EXCLUDE] &&
1943 				!psf->sf_count[MCAST_INCLUDE];
1944 		} else
1945 			psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1946 }
1947 
1948 static int sf_setstate(struct ifmcaddr6 *pmc)
1949 {
1950 	struct ip6_sf_list *psf, *dpsf;
1951 	int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1952 	int qrv = pmc->idev->mc_qrv;
1953 	int new_in, rv;
1954 
1955 	rv = 0;
1956 	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1957 		if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1958 			new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1959 				!psf->sf_count[MCAST_INCLUDE];
1960 		} else
1961 			new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1962 		if (new_in) {
1963 			if (!psf->sf_oldin) {
1964 				struct ip6_sf_list *prev = NULL;
1965 
1966 				for (dpsf=pmc->mca_tomb; dpsf;
1967 				     dpsf=dpsf->sf_next) {
1968 					if (ipv6_addr_equal(&dpsf->sf_addr,
1969 					    &psf->sf_addr))
1970 						break;
1971 					prev = dpsf;
1972 				}
1973 				if (dpsf) {
1974 					if (prev)
1975 						prev->sf_next = dpsf->sf_next;
1976 					else
1977 						pmc->mca_tomb = dpsf->sf_next;
1978 					kfree(dpsf);
1979 				}
1980 				psf->sf_crcount = qrv;
1981 				rv++;
1982 			}
1983 		} else if (psf->sf_oldin) {
1984 			psf->sf_crcount = 0;
1985 			/*
1986 			 * add or update "delete" records if an active filter
1987 			 * is now inactive
1988 			 */
1989 			for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
1990 				if (ipv6_addr_equal(&dpsf->sf_addr,
1991 				    &psf->sf_addr))
1992 					break;
1993 			if (!dpsf) {
1994 				dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1995 				if (!dpsf)
1996 					continue;
1997 				*dpsf = *psf;
1998 				/* pmc->mca_lock held by callers */
1999 				dpsf->sf_next = pmc->mca_tomb;
2000 				pmc->mca_tomb = dpsf;
2001 			}
2002 			dpsf->sf_crcount = qrv;
2003 			rv++;
2004 		}
2005 	}
2006 	return rv;
2007 }
2008 
2009 /*
2010  * Add multicast source filter list to the interface list
2011  */
2012 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2013 			  int sfmode, int sfcount, const struct in6_addr *psfsrc,
2014 			  int delta)
2015 {
2016 	struct ifmcaddr6 *pmc;
2017 	int	isexclude;
2018 	int	i, err;
2019 
2020 	if (!idev)
2021 		return -ENODEV;
2022 	read_lock_bh(&idev->lock);
2023 	for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2024 		if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2025 			break;
2026 	}
2027 	if (!pmc) {
2028 		/* MCA not found?? bug */
2029 		read_unlock_bh(&idev->lock);
2030 		return -ESRCH;
2031 	}
2032 	spin_lock_bh(&pmc->mca_lock);
2033 
2034 	sf_markstate(pmc);
2035 	isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2036 	if (!delta)
2037 		pmc->mca_sfcount[sfmode]++;
2038 	err = 0;
2039 	for (i=0; i<sfcount; i++) {
2040 		err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2041 		if (err)
2042 			break;
2043 	}
2044 	if (err) {
2045 		int j;
2046 
2047 		if (!delta)
2048 			pmc->mca_sfcount[sfmode]--;
2049 		for (j=0; j<i; j++)
2050 			ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2051 	} else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2052 		struct ip6_sf_list *psf;
2053 
2054 		/* filter mode change */
2055 		if (pmc->mca_sfcount[MCAST_EXCLUDE])
2056 			pmc->mca_sfmode = MCAST_EXCLUDE;
2057 		else if (pmc->mca_sfcount[MCAST_INCLUDE])
2058 			pmc->mca_sfmode = MCAST_INCLUDE;
2059 		/* else no filters; keep old mode for reports */
2060 
2061 		pmc->mca_crcount = idev->mc_qrv;
2062 		idev->mc_ifc_count = pmc->mca_crcount;
2063 		for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2064 			psf->sf_crcount = 0;
2065 		mld_ifc_event(idev);
2066 	} else if (sf_setstate(pmc))
2067 		mld_ifc_event(idev);
2068 	spin_unlock_bh(&pmc->mca_lock);
2069 	read_unlock_bh(&idev->lock);
2070 	return err;
2071 }
2072 
2073 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2074 {
2075 	struct ip6_sf_list *psf, *nextpsf;
2076 
2077 	for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2078 		nextpsf = psf->sf_next;
2079 		kfree(psf);
2080 	}
2081 	pmc->mca_tomb = NULL;
2082 	for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2083 		nextpsf = psf->sf_next;
2084 		kfree(psf);
2085 	}
2086 	pmc->mca_sources = NULL;
2087 	pmc->mca_sfmode = MCAST_EXCLUDE;
2088 	pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2089 	pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2090 }
2091 
2092 
2093 static void igmp6_join_group(struct ifmcaddr6 *ma)
2094 {
2095 	unsigned long delay;
2096 
2097 	if (ma->mca_flags & MAF_NOREPORT)
2098 		return;
2099 
2100 	igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2101 
2102 	delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2103 
2104 	spin_lock_bh(&ma->mca_lock);
2105 	if (del_timer(&ma->mca_timer)) {
2106 		atomic_dec(&ma->mca_refcnt);
2107 		delay = ma->mca_timer.expires - jiffies;
2108 	}
2109 
2110 	if (!mod_timer(&ma->mca_timer, jiffies + delay))
2111 		atomic_inc(&ma->mca_refcnt);
2112 	ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2113 	spin_unlock_bh(&ma->mca_lock);
2114 }
2115 
2116 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2117 			    struct inet6_dev *idev)
2118 {
2119 	int err;
2120 
2121 	/* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2122 	 * so no other readers or writers of iml or its sflist
2123 	 */
2124 	if (!iml->sflist) {
2125 		/* any-source empty exclude case */
2126 		return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2127 	}
2128 	err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2129 		iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2130 	sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2131 	iml->sflist = NULL;
2132 	return err;
2133 }
2134 
2135 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2136 {
2137 	if (MLD_V1_SEEN(ma->idev)) {
2138 		if (ma->mca_flags & MAF_LAST_REPORTER)
2139 			igmp6_send(&ma->mca_addr, ma->idev->dev,
2140 				ICMPV6_MGM_REDUCTION);
2141 	} else {
2142 		mld_add_delrec(ma->idev, ma);
2143 		mld_ifc_event(ma->idev);
2144 	}
2145 }
2146 
2147 static void mld_gq_timer_expire(unsigned long data)
2148 {
2149 	struct inet6_dev *idev = (struct inet6_dev *)data;
2150 
2151 	idev->mc_gq_running = 0;
2152 	mld_send_report(idev, NULL);
2153 	__in6_dev_put(idev);
2154 }
2155 
2156 static void mld_ifc_timer_expire(unsigned long data)
2157 {
2158 	struct inet6_dev *idev = (struct inet6_dev *)data;
2159 
2160 	mld_send_cr(idev);
2161 	if (idev->mc_ifc_count) {
2162 		idev->mc_ifc_count--;
2163 		if (idev->mc_ifc_count)
2164 			mld_ifc_start_timer(idev, idev->mc_maxdelay);
2165 	}
2166 	__in6_dev_put(idev);
2167 }
2168 
2169 static void mld_ifc_event(struct inet6_dev *idev)
2170 {
2171 	if (MLD_V1_SEEN(idev))
2172 		return;
2173 	idev->mc_ifc_count = idev->mc_qrv;
2174 	mld_ifc_start_timer(idev, 1);
2175 }
2176 
2177 
2178 static void igmp6_timer_handler(unsigned long data)
2179 {
2180 	struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2181 
2182 	if (MLD_V1_SEEN(ma->idev))
2183 		igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2184 	else
2185 		mld_send_report(ma->idev, ma);
2186 
2187 	spin_lock(&ma->mca_lock);
2188 	ma->mca_flags |=  MAF_LAST_REPORTER;
2189 	ma->mca_flags &= ~MAF_TIMER_RUNNING;
2190 	spin_unlock(&ma->mca_lock);
2191 	ma_put(ma);
2192 }
2193 
2194 /* Device changing type */
2195 
2196 void ipv6_mc_unmap(struct inet6_dev *idev)
2197 {
2198 	struct ifmcaddr6 *i;
2199 
2200 	/* Install multicast list, except for all-nodes (already installed) */
2201 
2202 	read_lock_bh(&idev->lock);
2203 	for (i = idev->mc_list; i; i = i->next)
2204 		igmp6_group_dropped(i);
2205 	read_unlock_bh(&idev->lock);
2206 }
2207 
2208 void ipv6_mc_remap(struct inet6_dev *idev)
2209 {
2210 	ipv6_mc_up(idev);
2211 }
2212 
2213 /* Device going down */
2214 
2215 void ipv6_mc_down(struct inet6_dev *idev)
2216 {
2217 	struct ifmcaddr6 *i;
2218 
2219 	/* Withdraw multicast list */
2220 
2221 	read_lock_bh(&idev->lock);
2222 	idev->mc_ifc_count = 0;
2223 	if (del_timer(&idev->mc_ifc_timer))
2224 		__in6_dev_put(idev);
2225 	idev->mc_gq_running = 0;
2226 	if (del_timer(&idev->mc_gq_timer))
2227 		__in6_dev_put(idev);
2228 
2229 	for (i = idev->mc_list; i; i=i->next)
2230 		igmp6_group_dropped(i);
2231 	read_unlock_bh(&idev->lock);
2232 
2233 	mld_clear_delrec(idev);
2234 }
2235 
2236 
2237 /* Device going up */
2238 
2239 void ipv6_mc_up(struct inet6_dev *idev)
2240 {
2241 	struct ifmcaddr6 *i;
2242 
2243 	/* Install multicast list, except for all-nodes (already installed) */
2244 
2245 	read_lock_bh(&idev->lock);
2246 	for (i = idev->mc_list; i; i=i->next)
2247 		igmp6_group_added(i);
2248 	read_unlock_bh(&idev->lock);
2249 }
2250 
2251 /* IPv6 device initialization. */
2252 
2253 void ipv6_mc_init_dev(struct inet6_dev *idev)
2254 {
2255 	write_lock_bh(&idev->lock);
2256 	spin_lock_init(&idev->mc_lock);
2257 	idev->mc_gq_running = 0;
2258 	setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2259 			(unsigned long)idev);
2260 	idev->mc_tomb = NULL;
2261 	idev->mc_ifc_count = 0;
2262 	setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2263 			(unsigned long)idev);
2264 	idev->mc_qrv = MLD_QRV_DEFAULT;
2265 	idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2266 	idev->mc_v1_seen = 0;
2267 	write_unlock_bh(&idev->lock);
2268 }
2269 
2270 /*
2271  *	Device is about to be destroyed: clean up.
2272  */
2273 
2274 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2275 {
2276 	struct ifmcaddr6 *i;
2277 
2278 	/* Deactivate timers */
2279 	ipv6_mc_down(idev);
2280 
2281 	/* Delete all-nodes address. */
2282 	/* We cannot call ipv6_dev_mc_dec() directly, our caller in
2283 	 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2284 	 * fail.
2285 	 */
2286 	__ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2287 
2288 	if (idev->cnf.forwarding)
2289 		__ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2290 
2291 	write_lock_bh(&idev->lock);
2292 	while ((i = idev->mc_list) != NULL) {
2293 		idev->mc_list = i->next;
2294 		write_unlock_bh(&idev->lock);
2295 
2296 		igmp6_group_dropped(i);
2297 		ma_put(i);
2298 
2299 		write_lock_bh(&idev->lock);
2300 	}
2301 	write_unlock_bh(&idev->lock);
2302 }
2303 
2304 #ifdef CONFIG_PROC_FS
2305 struct igmp6_mc_iter_state {
2306 	struct seq_net_private p;
2307 	struct net_device *dev;
2308 	struct inet6_dev *idev;
2309 };
2310 
2311 #define igmp6_mc_seq_private(seq)	((struct igmp6_mc_iter_state *)(seq)->private)
2312 
2313 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2314 {
2315 	struct ifmcaddr6 *im = NULL;
2316 	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2317 	struct net *net = seq_file_net(seq);
2318 
2319 	state->idev = NULL;
2320 	for_each_netdev_rcu(net, state->dev) {
2321 		struct inet6_dev *idev;
2322 		idev = __in6_dev_get(state->dev);
2323 		if (!idev)
2324 			continue;
2325 		read_lock_bh(&idev->lock);
2326 		im = idev->mc_list;
2327 		if (im) {
2328 			state->idev = idev;
2329 			break;
2330 		}
2331 		read_unlock_bh(&idev->lock);
2332 	}
2333 	return im;
2334 }
2335 
2336 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2337 {
2338 	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2339 
2340 	im = im->next;
2341 	while (!im) {
2342 		if (likely(state->idev != NULL))
2343 			read_unlock_bh(&state->idev->lock);
2344 
2345 		state->dev = next_net_device_rcu(state->dev);
2346 		if (!state->dev) {
2347 			state->idev = NULL;
2348 			break;
2349 		}
2350 		state->idev = __in6_dev_get(state->dev);
2351 		if (!state->idev)
2352 			continue;
2353 		read_lock_bh(&state->idev->lock);
2354 		im = state->idev->mc_list;
2355 	}
2356 	return im;
2357 }
2358 
2359 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2360 {
2361 	struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2362 	if (im)
2363 		while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2364 			--pos;
2365 	return pos ? NULL : im;
2366 }
2367 
2368 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2369 	__acquires(RCU)
2370 {
2371 	rcu_read_lock();
2372 	return igmp6_mc_get_idx(seq, *pos);
2373 }
2374 
2375 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2376 {
2377 	struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2378 
2379 	++*pos;
2380 	return im;
2381 }
2382 
2383 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2384 	__releases(RCU)
2385 {
2386 	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2387 
2388 	if (likely(state->idev != NULL)) {
2389 		read_unlock_bh(&state->idev->lock);
2390 		state->idev = NULL;
2391 	}
2392 	state->dev = NULL;
2393 	rcu_read_unlock();
2394 }
2395 
2396 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2397 {
2398 	struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2399 	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2400 
2401 	seq_printf(seq,
2402 		   "%-4d %-15s %pi6 %5d %08X %ld\n",
2403 		   state->dev->ifindex, state->dev->name,
2404 		   &im->mca_addr,
2405 		   im->mca_users, im->mca_flags,
2406 		   (im->mca_flags&MAF_TIMER_RUNNING) ?
2407 		   jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2408 	return 0;
2409 }
2410 
2411 static const struct seq_operations igmp6_mc_seq_ops = {
2412 	.start	=	igmp6_mc_seq_start,
2413 	.next	=	igmp6_mc_seq_next,
2414 	.stop	=	igmp6_mc_seq_stop,
2415 	.show	=	igmp6_mc_seq_show,
2416 };
2417 
2418 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2419 {
2420 	return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2421 			    sizeof(struct igmp6_mc_iter_state));
2422 }
2423 
2424 static const struct file_operations igmp6_mc_seq_fops = {
2425 	.owner		=	THIS_MODULE,
2426 	.open		=	igmp6_mc_seq_open,
2427 	.read		=	seq_read,
2428 	.llseek		=	seq_lseek,
2429 	.release	=	seq_release_net,
2430 };
2431 
2432 struct igmp6_mcf_iter_state {
2433 	struct seq_net_private p;
2434 	struct net_device *dev;
2435 	struct inet6_dev *idev;
2436 	struct ifmcaddr6 *im;
2437 };
2438 
2439 #define igmp6_mcf_seq_private(seq)	((struct igmp6_mcf_iter_state *)(seq)->private)
2440 
2441 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2442 {
2443 	struct ip6_sf_list *psf = NULL;
2444 	struct ifmcaddr6 *im = NULL;
2445 	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2446 	struct net *net = seq_file_net(seq);
2447 
2448 	state->idev = NULL;
2449 	state->im = NULL;
2450 	for_each_netdev_rcu(net, state->dev) {
2451 		struct inet6_dev *idev;
2452 		idev = __in6_dev_get(state->dev);
2453 		if (unlikely(idev == NULL))
2454 			continue;
2455 		read_lock_bh(&idev->lock);
2456 		im = idev->mc_list;
2457 		if (likely(im != NULL)) {
2458 			spin_lock_bh(&im->mca_lock);
2459 			psf = im->mca_sources;
2460 			if (likely(psf != NULL)) {
2461 				state->im = im;
2462 				state->idev = idev;
2463 				break;
2464 			}
2465 			spin_unlock_bh(&im->mca_lock);
2466 		}
2467 		read_unlock_bh(&idev->lock);
2468 	}
2469 	return psf;
2470 }
2471 
2472 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2473 {
2474 	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2475 
2476 	psf = psf->sf_next;
2477 	while (!psf) {
2478 		spin_unlock_bh(&state->im->mca_lock);
2479 		state->im = state->im->next;
2480 		while (!state->im) {
2481 			if (likely(state->idev != NULL))
2482 				read_unlock_bh(&state->idev->lock);
2483 
2484 			state->dev = next_net_device_rcu(state->dev);
2485 			if (!state->dev) {
2486 				state->idev = NULL;
2487 				goto out;
2488 			}
2489 			state->idev = __in6_dev_get(state->dev);
2490 			if (!state->idev)
2491 				continue;
2492 			read_lock_bh(&state->idev->lock);
2493 			state->im = state->idev->mc_list;
2494 		}
2495 		if (!state->im)
2496 			break;
2497 		spin_lock_bh(&state->im->mca_lock);
2498 		psf = state->im->mca_sources;
2499 	}
2500 out:
2501 	return psf;
2502 }
2503 
2504 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2505 {
2506 	struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2507 	if (psf)
2508 		while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2509 			--pos;
2510 	return pos ? NULL : psf;
2511 }
2512 
2513 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2514 	__acquires(RCU)
2515 {
2516 	rcu_read_lock();
2517 	return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2518 }
2519 
2520 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2521 {
2522 	struct ip6_sf_list *psf;
2523 	if (v == SEQ_START_TOKEN)
2524 		psf = igmp6_mcf_get_first(seq);
2525 	else
2526 		psf = igmp6_mcf_get_next(seq, v);
2527 	++*pos;
2528 	return psf;
2529 }
2530 
2531 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2532 	__releases(RCU)
2533 {
2534 	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2535 	if (likely(state->im != NULL)) {
2536 		spin_unlock_bh(&state->im->mca_lock);
2537 		state->im = NULL;
2538 	}
2539 	if (likely(state->idev != NULL)) {
2540 		read_unlock_bh(&state->idev->lock);
2541 		state->idev = NULL;
2542 	}
2543 	state->dev = NULL;
2544 	rcu_read_unlock();
2545 }
2546 
2547 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2548 {
2549 	struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2550 	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2551 
2552 	if (v == SEQ_START_TOKEN) {
2553 		seq_printf(seq,
2554 			   "%3s %6s "
2555 			   "%32s %32s %6s %6s\n", "Idx",
2556 			   "Device", "Multicast Address",
2557 			   "Source Address", "INC", "EXC");
2558 	} else {
2559 		seq_printf(seq,
2560 			   "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2561 			   state->dev->ifindex, state->dev->name,
2562 			   &state->im->mca_addr,
2563 			   &psf->sf_addr,
2564 			   psf->sf_count[MCAST_INCLUDE],
2565 			   psf->sf_count[MCAST_EXCLUDE]);
2566 	}
2567 	return 0;
2568 }
2569 
2570 static const struct seq_operations igmp6_mcf_seq_ops = {
2571 	.start	=	igmp6_mcf_seq_start,
2572 	.next	=	igmp6_mcf_seq_next,
2573 	.stop	=	igmp6_mcf_seq_stop,
2574 	.show	=	igmp6_mcf_seq_show,
2575 };
2576 
2577 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2578 {
2579 	return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2580 			    sizeof(struct igmp6_mcf_iter_state));
2581 }
2582 
2583 static const struct file_operations igmp6_mcf_seq_fops = {
2584 	.owner		=	THIS_MODULE,
2585 	.open		=	igmp6_mcf_seq_open,
2586 	.read		=	seq_read,
2587 	.llseek		=	seq_lseek,
2588 	.release	=	seq_release_net,
2589 };
2590 
2591 static int __net_init igmp6_proc_init(struct net *net)
2592 {
2593 	int err;
2594 
2595 	err = -ENOMEM;
2596 	if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2597 		goto out;
2598 	if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2599 				  &igmp6_mcf_seq_fops))
2600 		goto out_proc_net_igmp6;
2601 
2602 	err = 0;
2603 out:
2604 	return err;
2605 
2606 out_proc_net_igmp6:
2607 	proc_net_remove(net, "igmp6");
2608 	goto out;
2609 }
2610 
2611 static void __net_exit igmp6_proc_exit(struct net *net)
2612 {
2613 	proc_net_remove(net, "mcfilter6");
2614 	proc_net_remove(net, "igmp6");
2615 }
2616 #else
2617 static inline int igmp6_proc_init(struct net *net)
2618 {
2619 	return 0;
2620 }
2621 static inline void igmp6_proc_exit(struct net *net)
2622 {
2623 }
2624 #endif
2625 
2626 static int __net_init igmp6_net_init(struct net *net)
2627 {
2628 	int err;
2629 
2630 	err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2631 				   SOCK_RAW, IPPROTO_ICMPV6, net);
2632 	if (err < 0) {
2633 		pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2634 		       err);
2635 		goto out;
2636 	}
2637 
2638 	inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2639 
2640 	err = igmp6_proc_init(net);
2641 	if (err)
2642 		goto out_sock_create;
2643 out:
2644 	return err;
2645 
2646 out_sock_create:
2647 	inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2648 	goto out;
2649 }
2650 
2651 static void __net_exit igmp6_net_exit(struct net *net)
2652 {
2653 	inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2654 	igmp6_proc_exit(net);
2655 }
2656 
2657 static struct pernet_operations igmp6_net_ops = {
2658 	.init = igmp6_net_init,
2659 	.exit = igmp6_net_exit,
2660 };
2661 
2662 int __init igmp6_init(void)
2663 {
2664 	return register_pernet_subsys(&igmp6_net_ops);
2665 }
2666 
2667 void igmp6_cleanup(void)
2668 {
2669 	unregister_pernet_subsys(&igmp6_net_ops);
2670 }
2671